Contents: Preface. I. The General characters of fishes: 1. Origin and nature of a fish. 2. Form and movements of fishes. 3. Skin and coloration of fishes. 4. Size and age of fishes. 5. Organisation. II. The habits of fishes in general: 1. Haunts of fishes. 2. Wanderings of fishes. 3. Feeding habits. 4. Breeding habits. III. Migration of fishes: 1. Tunny. 2. Herring. 3. Anchovy. 4. Salmon. 5. Eel. 6. Causes of migration. IV. The development of fishes: 1. Eggs of fishes. 2. Embryos. 3. Larva and postlarva. 4. Origin of ossified structures. V. Regulation of the form and structures: 1. The influence of balance and movement on the formation of structure. 2. Causes of change in the balance. 3. Formation of the head. 4. Transformations. VI. Economy of the body. I. Production and transport of energy: 1. Digestive system. 2. Circulation and respiration. 3. Excretory system. VII. Economy of the body. II. Utilisation and emission of energy: 1. Regulating system. 2. Muscular system and electric organs. 3. Mucus glands and radiant energy. 4. Sensory nervous system. 5. Eyes of fishes; sense of colour. 6. Central nervous system. VIII. Variation and differentiation of fishes: 1. Nature of variation. 2. Heredity and circumstances. 3. Causes of variation. 4. Differentiation of fishes. IX. The genealogy of fishes: 1. The oldest fishes. 2. Arrangement of fishes. 3. The drifting of the continents. X. Distribution of fishes in time and space: 1. Ancient periods; land and water in palaeozoic and mesozoic. 2. Modern periods; appearance of modern forms in Chalk period; effect of tertiary disturbances; post-glacial distribution. XI. Adaptations to suit particular conditions: 1. Growth of adaptations. 2. Adaptations connected with the mode of life. 3. Adaptations connected with the respiration. XII. Fishes and the web of life: 1. Sex, courtship and reproduction. 2. Commensalists and parasites. 3. Diseases and enemies of fishes. XIII. The food question: 1. The food of fishes. 2. The valuation of the sea. 3. Resources of the sea. XIV. The mental life of fishes: 1. Tropisms and reflex actions. 2. Intelligence and adaptations. 3. Reason and parental care. 4. The feelings of fishes. Appendix: Synopsis of the families of fishes. Bibliography: 1. A few general books dealing with fishes. 2. Books and papers used in the text. Index. No. 8062

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